An electro-pneumatic relief control mechanism and method for a rail vehicle braking system

Abstract

The present invention relates to the field of rail train braking technology, and specifically to an electro-pneumatic relief control mechanism and method for a rail vehicle braking system, wherein the control mechanism includes an air storage cylinder and a brake cylinder connected to a train brake pipe, an exhaust pipeline is connected to the brake cylinder, and the exhaust pipeline is controlled to be on and off by an electronic control device; it also includes a control module for data analysis and processing and generating on-off instructions, and the electronic control device adjusts the on-off of the exhaust pipeline according to the on-off instructions. The present invention temporarily stores compressed air in an air storage cylinder to ensure the stability of the air pressure entering the brake cylinder, and relieves and releases the pressure in stages through an electronic control device, so as to accurately control the braking relief process of the train, improve the synchronization and accuracy of braking, improve the braking effect, and avoid the situation of braking delay.

Description

Technical Field

[0001] The present invention relates to the technical field of rail vehicle braking, and in particular to an electro-pneumatic relief control mechanism and method for a rail vehicle braking system. Background Art

[0002] At present, the main braking method for freight trains at home and abroad is air braking. Air braking transmits braking signals through air waves, and its speed is about 2 / 3 of the speed of sound. The braking time increases significantly with the increase of train length. During the braking process, the air wave transmission leads to inconsistent braking time of each train formation, resulting in serious longitudinal impulse of the train, which restricts the speed and carrying capacity of freight trains. This method is more suitable for low-speed and light-loaded freight trains.

[0003] It can be seen that the existing pure air braking method has the problem of poor braking synchronization, and the braking and relief action control of the train is not timely and accurate enough, which is not conducive to increasing the speed and carrying capacity of freight trains. Therefore, it is necessary to propose a more reasonable technical solution to solve the technical problems existing in the existing technology. Summary of the invention

[0004] In order to overcome at least one of the defects mentioned above, the present invention provides an electro-pneumatic relief control mechanism and method for a rail vehicle braking system, which forms a precise braking structure through circuit control combined with air braking, and performs segmented control braking according to the train's running speed and carrying capacity, thereby improving the braking effect of the train and eliminating the safety hazards of train braking.

[0005] In order to achieve the above-mentioned purpose, the mitigation control mechanism disclosed in the present invention can adopt the following technical solutions:

[0006] A rail vehicle braking system electro-pneumatic relief control mechanism includes an air storage cylinder and a brake cylinder connected to a train brake pipe, the brake cylinder is connected to an exhaust pipeline, and the exhaust pipeline is controlled to be on and off by an electronic control device; it also includes a control module for data analysis and processing and generating on-off instructions, and the electronic control device adjusts the on-off of the exhaust pipeline according to the on-off instructions.

[0007] The relief control mechanism disclosed above provides compressed air through the train brake pipe, and passes the compressed air into the air storage cylinder for temporary storage to keep the pressure of the compressed air entering the brake cylinder stable. Braking can be performed after the compressed air enters the brake cylinder, and relief is performed when the air in the brake cylinder is released outward and the pressure of the brake cylinder is reduced. The relief control mechanism disclosed here sets a set of automatic control functions, which is monitored and executed by the control module, so that the electronic control device performs opening and closing operations multiple times, gradually releasing the air in the brake cylinder to achieve the purpose of pressure relief. This process can improve the relief effect of the train, making the braking effect efficiency of the train more precise and synchronized, and more safe and reliable.

[0008] Furthermore, in order to ensure the accuracy of the electronic control device, the pressure in the brake cylinder is monitored. The specific solution that can be adopted is not limited to the only one. Here, it is optimized and one feasible option is given: it also includes a pressure detection module, which is used to detect the air pressure value in the brake cylinder and transmit it to the control module in real time. When such a solution is adopted, the pressure detection module can adopt an intrusive structure or a non-intrusive structure.

[0009] Furthermore, in the present invention, the pressure detection module for detecting the brake cylinder pressure is not limited to a single one. Here, an optimization is made and one feasible option is given: the pressure detection module includes a pressure sensor, which is arranged at the brake cylinder and electrically connected to the control module. When such a solution is adopted, the pressure sensor converts the pressure value detection result in the brake cylinder into a numerical value, and transmits it to the control module as a signal for analysis and processing. The control module adjusts the start and stop of the electronic control module in real time according to the pressure detection result to release or stop the pressure release of the brake cylinder.

[0010] Furthermore, the electronic control device used in the present invention is not limited to the only one, and an optimization is made here and one feasible option is given: the electronic control device includes a solenoid valve. When such a solution is adopted, the solenoid valve closes the passage of the exhaust pipeline or opens the passage of the exhaust pipeline under the instruction of the control module.

[0011] Furthermore, in the present invention, the gas released from the brake cylinder can be sent to other gas paths, which is not limited here and one feasible option is given: the exhaust pipeline is connected to the atmosphere.

[0012] The above discloses the mitigation control mechanism provided by the present invention. The present invention also discloses a mitigation control method, which is explained here.

[0013] A rail vehicle braking system electro-pneumatic relief control method, using the above disclosed relief control mechanism, comprises:

[0014] Set several relief stages and preset the brake cylinder relief pressure value for each stage;

[0015] In each relief stage, the brake cylinder is depressurized for a set time t, and the depressurization is completed and maintained for a set time T; after the relief stage ends, if the pressure value in the brake cylinder drops to the preset pressure value of this stage, the next relief stage is entered, otherwise the relief stage is repeated;

[0016] When the air pressure in the brake cylinder is equal to the preset pressure value of the final relief stage, the relief ends.

[0017] The above-disclosed relief control method releases the pressure of the brake cylinder multiple times to gradually reduce the pressure of the brake cylinder to a set value, so that the braking relief process is more stable and reliable, the braking effect is more precise, and the braking delay caused by inconsistent braking progress of multiple brake cylinders is avoided, thereby improving safety and reliability.

[0018] Furthermore, in the present invention, the pressure reduction distribution ratio for the pressure in different relief stages can be set according to the actual braking demand. Specifically, the following feasible option can be adopted: the pressure value in the brake cylinder before relief is used as the initial pressure P, and the preset pressure values ​​of each relief stage are P1, P2, P3...P n , the pressure drop in each relief stage corresponds to the initial pressure P at a%, b%, c%...n% respectively. When such a scheme is adopted, it can be flexibly adjusted according to different vehicle lengths, driving speeds, loads, etc., and the total number of relief stages and the pressure drop ratio in each relief stage can be set.

[0019] Furthermore, in order to detect the pressure drop effect in the relief stage, in the relief stage, the pressure value in the brake cylinder is detected in real time by the pressure detection module, and the pressure value is transmitted to the control module, and the control module controls the brake cylinder pressure release according to the detection result.

[0020] Furthermore, in the relief stage, the exhaust line is opened by the electronic control device to release the pressure in the brake cylinder, or the exhaust line is closed by the electronic control device to stop releasing the pressure in the brake cylinder.

[0021] Compared with the prior art, some beneficial effects of the technical solution disclosed in the present invention include:

[0022] The present invention temporarily stores compressed air in an air storage cylinder to ensure the stability of the air pressure entering the brake cylinder, and releases the air in stages through an electronic control device, thereby accurately controlling the braking relief process of the train, improving the synchronization and accuracy of braking, improving the braking effect, and avoiding braking delays. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only represent some embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 Schematic diagram of the composition structure of the relief control mechanism.

[0025] Figure 2 This is a logical diagram of electro-pneumatic mitigation. DETAILED DESCRIPTION

[0026] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments.

[0027] In view of the delay in the air signals provided by the train brake pipe to different carriages in the prior art, which leads to asynchronous braking relief in different carriages and inaccurate braking, thus affecting the train's speed and carrying capacity, the following embodiments are optimized and improved to overcome the above defects.

[0028] Example 1

[0029] like Figure 1 , Figure 2 As shown, this embodiment provides an electro-pneumatic relief control mechanism for a rail vehicle braking system, including an air storage cylinder and a brake cylinder connected to a train brake pipe, the brake cylinder is connected to an exhaust pipeline, and the exhaust pipeline is controlled to be on and off by an electronic control device; it also includes a control module for data analysis and processing and generating on-off instructions, and the electronic control device adjusts the on-off of the exhaust pipeline according to the on-off instructions.

[0030] The relief control mechanism disclosed in this embodiment provides compressed air through the train brake pipe, and passes the compressed air into the air storage cylinder for temporary storage to keep the pressure of the compressed air entering the brake cylinder stable. Braking can be performed after the compressed air enters the brake cylinder, and relief is performed when the air in the brake cylinder is released outward and the pressure of the brake cylinder is reduced. The relief control mechanism disclosed herein sets a set of automatic control functions, which is monitored and executed by the control module, so that the electronic control device performs opening and closing operations multiple times, gradually releasing the air in the brake cylinder to achieve the purpose of pressure relief. This process can improve the relief effect of the train, making the braking effect efficiency of the train more precise and synchronous, and more safe and reliable.

[0031] In order to ensure the accuracy of the electronic control device, the pressure in the brake cylinder is monitored. The specific solution that can be adopted is not limited to the only one. This embodiment optimizes and adopts one of the feasible options: it also includes a pressure detection module, which is used to detect the air pressure value in the brake cylinder and transmit it to the control module in real time. When such a solution is adopted, the pressure detection module can adopt an intrusive structure or a non-intrusive structure.

[0032] Preferably, in order to more accurately measure the pressure in the brake cylinder, an intrusive pressure detection module can be used, a test hole is opened on the brake cylinder and a detection head of the pressure detection module is placed, and the detection control is sealed.

[0033] In this embodiment, the pressure detection module used to detect the brake cylinder pressure is not limited to a single one. This embodiment is optimized and adopts one of the feasible options: the pressure detection module includes a pressure sensor, which is arranged at the brake cylinder and electrically connected to the control module. When such a solution is adopted, the pressure sensor converts the pressure value detection result in the brake cylinder into a numerical value, and transmits it to the control module as a signal for analysis and processing. The control module adjusts the start and stop of the electronic control module in real time according to the pressure detection result to release or stop the pressure release of the brake cylinder.

[0034] The electronic control device used in this embodiment is not limited to the only one, and an optimization is made here and one of the feasible options is adopted: the electronic control device includes a solenoid valve. When such a solution is adopted, the solenoid valve closes the passage of the exhaust pipeline or opens the passage of the exhaust pipeline under the instruction of the control module.

[0035] Preferably, the solenoid valve used in this embodiment is a two-position, two-way valve.

[0036] In this embodiment, the gas released from the brake cylinder can be sent to other gas paths. This embodiment does not make a sole limitation and adopts one of the feasible options: the exhaust pipeline is connected to the atmosphere.

[0037] Example 2

[0038] The above-mentioned embodiment discloses the mitigation control mechanism provided by the present invention, and this embodiment discloses the mitigation control method, which is explained here.

[0039] like Figure 2 As shown, a rail vehicle braking system electro-pneumatic relief control method adopts the relief control mechanism disclosed in the above embodiment, including:

[0040] S1: Set several relief stages and preset the brake cylinder relief pressure value for each stage.

[0041] S2: In each relief stage, the brake cylinder is depressurized for a set time t, and the depressurization is completed and maintained for a set time T; after the relief stage, if the pressure value in the brake cylinder is reduced to the preset pressure value of this stage, the next relief stage is entered, otherwise the relief stage is repeated;

[0042] Preferably, in this embodiment, the pressure reduction distribution ratio is set for the pressure in different relief stages, which can be set according to the actual braking demand. Specifically, the following feasible option can be adopted: the pressure value in the brake cylinder before relief is used as the initial pressure P, and the preset pressure values ​​of each relief stage are P1, P2, P3...P n, the pressure drop in each relief stage corresponds to the initial pressure P at a%, b%, c%...n% respectively. When such a scheme is adopted, it can be flexibly adjusted according to different vehicle lengths, driving speeds, loads, etc., and the total number of relief stages and the pressure drop ratio in each relief stage can be set.

[0043] In this way, P1 = P*(1-a%), P2 = P*(1-a%-b%), P3 = P*(1-a%-b%-c%)..., let the final preset pressure be P n , and the current measured pressure value is P z After the final brake release is completed, P z With P n equal.

[0044] In order to detect the pressure drop effect in the relief stage, during the relief stage, the pressure value in the brake cylinder is detected in real time by the pressure detection module, and the pressure value is transmitted to the control module, and the control module controls the brake cylinder pressure release according to the detection result.

[0045] Preferably, in the relief phase, the exhaust line is opened by the electronic control device to release the pressure in the brake cylinder, or the exhaust line is closed by the electronic control device to stop releasing the pressure in the brake cylinder.

[0046] S3: When the air pressure in the brake cylinder is equal to the preset pressure value of the final relief stage, the relief ends.

[0047] The above-disclosed relief control method releases the pressure of the brake cylinder multiple times to gradually reduce the pressure of the brake cylinder to a set value, so that the braking relief process is more stable and reliable, the braking effect is more precise, and the braking delay caused by inconsistent braking progress of multiple brake cylinders is avoided, thereby improving safety and reliability.

[0048] The above are the implementation methods listed in this embodiment, but this embodiment is not limited to the above optional implementation methods. Those skilled in the art can arbitrarily combine the above methods to obtain other various implementation methods. Anyone can derive other various implementation methods under the inspiration of this embodiment. The above specific implementation methods should not be understood as limiting the protection scope of this embodiment. The protection scope of this embodiment should be based on the definition in the claims.

Claims

1. A method for controlling an electro-pneumatic relief of a rail vehicle braking system, which adopts an electro-pneumatic relief control mechanism of a rail vehicle braking system, wherein the control mechanism comprises an air storage cylinder and a brake cylinder connected to a train brake pipe, wherein an exhaust pipeline is connected to the brake cylinder, and the exhaust pipeline is controlled to be on and off by an electronic control device; further comprising a control module for data analysis and processing and generating on-off instructions, wherein the electronic control device adjusts the on-off of the exhaust pipeline according to the on-off instructions; further comprising a pressure detection module, wherein the pressure detection module is used to detect the air pressure value in the brake cylinder and transmit it to the control module in real time; the pressure detection module comprises a pressure sensor, which is arranged at the brake cylinder and is electrically connected to the control module; the electronic control device comprises an electromagnetic valve; the exhaust pipeline is connected to the atmosphere; and it is characterized in that Control methods include: Set several relief stages and preset the brake cylinder relief pressure value for each stage; During each release phase, the brake cylinder is depressurized for a set period of time. t , pressure release ends and holds for the set time T ; After the end of this relief stage, if the pressure value in the brake cylinder drops to the preset pressure value of this stage, it will enter the next relief stage, otherwise it will repeat this relief stage; When the air pressure in the brake cylinder is equal to the preset pressure value of the final relief stage, the relief ends.

2. The rail vehicle braking system electro-pneumatic relief control method according to claim 1, characterized in that: The pressure value in the brake cylinder before the release is used as the initial pressure P , the preset pressure values ​​for each relief stage are P 1, P 2, P3......P n , the pressure drop in each relief stage corresponds to the initial pressure P The proportions are a%, b%, c%......n% respectively.

3. The rail vehicle braking system electro-pneumatic relief control method according to claim 1, characterized in that: During the relief phase, the pressure value in the brake cylinder is detected in real time by the pressure detection module, and the pressure value is transmitted to the control module, which controls the brake cylinder pressure release according to the detection result.

4. The rail vehicle braking system electro-pneumatic relief control method according to claim 1 or 3, characterized in that: During the relief phase, the exhaust line is opened by the electronic control device to release the pressure in the brake cylinder, or the exhaust line is closed by the electronic control device to stop the pressure release in the brake cylinder.

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